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s = 1 / (2 - √2) × (2 + √2) / (2 + √2)
s = (2 + √2) / (4 - 2)
s = (2 + √2) / 2
L.Permukaan Kubus
= 6 × s × s
= 6 × {(2 + √2) / 2} × {(2 + √2) / 2}
= 6 × {(4 + 4√2 + 2) / 4}
= 6 × {(6 + 4√2) / 4}
= 3 × {(6 + 4√2) / 2}
= 3 × (3 + 2√2)
= 9 + 6√2